When modularity, affordability, and quality are all important the Mk4 T is the upper of choice. The Mk4 T introduces CMMG's RKM series of KeyMod free float hand guards and a nitrided 4140 CrMo steel barrel in a medium taper profile.
- Upper Receiver Type: MK4 T Flat-Top
- Barrel Length: 16"
- Barrel Contour: Medium
- Barrel Material: Chrome Moly
- Muzzle Thread Pattern: 1/2" -28
- Chrome Lined: No
- Barrel Finish: Salt bath Nitride
- Twist Rate: 1 in 7"
- Chamber: 5.56x45mm NATO
- M4 Feed Ramps: Yes
- Muzzle Device: A2 Flash Hider
- Gas System Length: Carbine
- Gas Block Diameter: 0.750"
- Handguard: CMMG RKM11 KeyMod Free Float Handguard
- Sights: None
- Bolt Carrier Assembly Included: Yes
- Bolt Carrier Type: Mil-Spec
Please Note: Installation of AR-15 upper assemblies with certain features including, but not limited to: flash hiders, bayonet lugs, and threaded muzzles may violate state and/or local laws.